What are the connection methods for HDPE pipes?
HDPE (High-Density Polyethylene) pipes can be connected in various ways depending on engineering requirements, pressure ratings, and construction conditions. Below are the common HDPE pipe connection methods and their characteristics:
1. Heat Fusion
Application: Pressure pipe systems (e.g., water supply, gas pipelines)
Advantages: Strong sealing, high joint strength (close to the pipe material itself)
Disadvantages: Requires specialized equipment and trained operators
|
Type |
Key Steps |
Applicable Pipe Sizes |
|
Butt Fusion |
Heats pipe ends to a molten state, then presses them together (requires trimming, temperature control at 200-220°C) |
DN20-DN1200 |
|
Electrofusion |
Uses fittings with built-in heating wires (automated temperature control, suitable for confined spaces) |
DN20-DN400 |
|
Socket Fusion |
Simultaneously heats pipe end and fitting before insertion (common for small-diameter pipes) |
DN20-DN110 |
2. Mechanical Joints
Application: Temporary projects, non-pressure pipelines, or repairs
Advantages: Quick installation, detachable
Disadvantages: Requires periodic sealing inspection
|
Type |
Features |
|
Flange Connection |
Bolted flange connection with gasket sealing, suitable for valve/equipment connections |
|
Clamp Coupling |
Uses stainless steel clamps to compress rubber seals, ideal for emergency repairs or connecting different materials |
|
Compression Fitting |
Seals via threaded compression, typically used for small pipes (DN ≤ 63) |
3. Other Connection Methods
|
Method |
Description |
|
Steel-Plastic Transition Fitting |
Connects HDPE to metal pipes (internal sealing and anti-pullout structure) |
|
Heat-Shrink Sleeve Connection |
Uses a heat-shrink sleeve to seal joints by flame heating (common for cable protection pipes) |
Selection Recommendations
Pressure pipelines: Prefer heat fusion (Butt Fusion > Electrofusion)
Non-pressure pipelines: Mechanical connections are more economical (e.g., clamp couplings for drainage pipes)
Special environments:
Underground concealed works → Heat fusion
Confined spaces → Electrofusion
Temporary projects → Flange/Clamp connections
Important Notes
Clean pipe ends before heat fusion to avoid contamination.
Mechanical connections require periodic seal inspection (recommended replacement every 5 years).
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